Libav
vsrc_color.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #include <stdio.h>
27 #include <string.h>
28 
29 #include "avfilter.h"
30 #include "formats.h"
31 #include "internal.h"
32 #include "video.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/colorspace.h"
35 #include "libavutil/imgutils.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/mem.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/parseutils.h"
41 #include "drawutils.h"
42 
43 typedef struct ColorContext {
44  const AVClass *class;
45  int w, h;
49  int line_step[4];
50  int hsub, vsub;
51  uint64_t pts;
52  char *color_str;
53  char *size_str;
55 } ColorContext;
56 
58 {
59  ColorContext *color = ctx->priv;
60  AVRational frame_rate_q;
61  int ret;
62 
63  if (av_parse_video_size(&color->w, &color->h, color->size_str) < 0) {
64  av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", color->size_str);
65  return AVERROR(EINVAL);
66  }
67 
68  if (av_parse_video_rate(&frame_rate_q, color->framerate_str) < 0 ||
69  frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
70  av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", color->framerate_str);
71  return AVERROR(EINVAL);
72  }
73  color->time_base.num = frame_rate_q.den;
74  color->time_base.den = frame_rate_q.num;
75 
76  if ((ret = av_parse_color(color->color, color->color_str, -1, ctx)) < 0)
77  return ret;
78 
79  return 0;
80 }
81 
83 {
84  ColorContext *color = ctx->priv;
85  int i;
86 
87  for (i = 0; i < 4; i++) {
88  av_freep(&color->line[i]);
89  color->line_step[i] = 0;
90  }
91 }
92 
94 {
95  static const enum AVPixelFormat pix_fmts[] = {
99 
106 
108  };
109 
111  return 0;
112 }
113 
114 static int color_config_props(AVFilterLink *inlink)
115 {
116  AVFilterContext *ctx = inlink->src;
117  ColorContext *color = ctx->priv;
118  uint8_t rgba_color[4];
119  int is_packed_rgba;
120  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
121 
122  color->hsub = pix_desc->log2_chroma_w;
123  color->vsub = pix_desc->log2_chroma_h;
124 
125  color->w &= ~((1 << color->hsub) - 1);
126  color->h &= ~((1 << color->vsub) - 1);
127  if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
128  return AVERROR(EINVAL);
129 
130  memcpy(rgba_color, color->color, sizeof(rgba_color));
131  ff_fill_line_with_color(color->line, color->line_step, color->w, color->color,
132  inlink->format, rgba_color, &is_packed_rgba, NULL);
133 
134  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
135  color->w, color->h, color->time_base.den, color->time_base.num,
136  color->color[0], color->color[1], color->color[2], color->color[3],
137  is_packed_rgba ? "rgba" : "yuva");
138  inlink->w = color->w;
139  inlink->h = color->h;
140  inlink->time_base = color->time_base;
141 
142  return 0;
143 }
144 
146 {
147  ColorContext *color = link->src->priv;
148  AVFrame *frame = ff_get_video_buffer(link, color->w, color->h);
149 
150  if (!frame)
151  return AVERROR(ENOMEM);
152 
153  frame->sample_aspect_ratio = (AVRational) {1, 1};
154  frame->pts = color->pts++;
155 
156  ff_draw_rectangle(frame->data, frame->linesize,
157  color->line, color->line_step, color->hsub, color->vsub,
158  0, 0, color->w, color->h);
159  return ff_filter_frame(link, frame);
160 }
161 
162 #define OFFSET(x) offsetof(ColorContext, x)
163 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
164 static const AVOption options[] = {
165  { "color", "Output video color", OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
166  { "size", "Output video size (wxh or an abbreviation)", OFFSET(size_str), AV_OPT_TYPE_STRING, { .str = "320x240" }, .flags = FLAGS },
167  { "framerate", "Output video framerate", OFFSET(framerate_str), AV_OPT_TYPE_STRING, { .str = "25" }, .flags = FLAGS },
168  { NULL },
169 };
170 
171 static const AVClass color_class = {
172  .class_name = "color",
173  .item_name = av_default_item_name,
174  .option = options,
175  .version = LIBAVUTIL_VERSION_INT,
176 };
177 
179  {
180  .name = "default",
181  .type = AVMEDIA_TYPE_VIDEO,
182  .request_frame = color_request_frame,
183  .config_props = color_config_props
184  },
185  { NULL }
186 };
187 
189  .name = "color",
190  .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
191 
192  .priv_class = &color_class,
193  .priv_size = sizeof(ColorContext),
194  .init = color_init,
195  .uninit = color_uninit,
196 
198 
199  .inputs = NULL,
200 
201  .outputs = avfilter_vsrc_color_outputs,
202 };
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:1599
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:122
AVOption.
Definition: opt.h:234
int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str)
Parse str and put in width_ptr and height_ptr the detected values.
Definition: parseutils.c:95
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:70
misc image utilities
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:232
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:67
memory handling functions
uint8_t * line[4]
Definition: vsrc_color.c:48
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_amix.c:514
int num
numerator
Definition: rational.h:44
Various defines for YUV<->RGB conversion.
int vsub
chroma subsampling values
Definition: vsrc_color.c:50
static const AVFilterPad avfilter_vsrc_color_outputs[]
Definition: vsrc_color.c:178
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:104
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:80
char * color_str
Definition: vsrc_color.c:52
AVFilter ff_vsrc_color
Definition: vsrc_color.c:188
static int color_config_props(AVFilterLink *inlink)
Definition: vsrc_color.c:114
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:165
uint8_t color[4]
Definition: vsrc_color.c:46
const char * name
Pad name.
Definition: internal.h:42
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:38
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:733
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:104
uint8_t
#define av_cold
Definition: attributes.h:66
AVOptions.
int line_step[4]
Definition: vsrc_color.c:49
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:211
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:97
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of PIX_FMT_YUV440P and setting color_range ...
Definition: pixfmt.h:103
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV422P and setting color_...
Definition: pixfmt.h:78
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:139
void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:379
static av_cold int color_init(AVFilterContext *ctx)
Definition: vsrc_color.c:57
int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen, void *log_ctx)
Put the RGBA values that correspond to color_string in rgba_color.
Definition: parseutils.c:300
A filter pad used for either input or output.
Definition: internal.h:36
uint64_t pts
Definition: vsrc_color.c:51
#define FLAGS
Definition: vsrc_color.c:163
static int query_formats(AVFilterContext *ctx)
Definition: vsrc_color.c:93
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:89
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:98
void * priv
private data for use by the filter
Definition: avfilter.h:584
static const AVClass color_class
Definition: vsrc_color.c:171
Definition: graph2dot.c:49
static av_cold void color_uninit(AVFilterContext *ctx)
Definition: vsrc_color.c:82
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:95
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:96
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:69
common internal API header
AVRational time_base
Definition: vsrc_color.c:47
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:222
char * size_str
Definition: vsrc_color.c:53
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV420P and setting color_...
Definition: pixfmt.h:77
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:68
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
NULL
Definition: eval.c:55
misc drawing utilities
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
av_default_item_name
Definition: dnxhdenc.c:52
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:206
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:71
Describe the class of an AVClass context structure.
Definition: log.h:33
Filter definition.
Definition: avfilter.h:421
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:221
rational number numerator/denominator
Definition: rational.h:43
const char * name
Filter name.
Definition: avfilter.h:425
misc parsing utilities
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV444P and setting color_...
Definition: pixfmt.h:79
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:72
int den
denominator
Definition: rational.h:45
static const uint8_t color[]
Definition: log.c:55
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4], enum AVPixelFormat pix_fmt, uint8_t rgba_color[4], int *is_packed_rgba, uint8_t rgba_map_ptr[4])
Definition: drawutils.c:29
An instance of a filter.
Definition: avfilter.h:563
char * framerate_str
Definition: vsrc_color.c:54
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:102
#define OFFSET(x)
Definition: vsrc_color.c:162
internal API functions
static int color_request_frame(AVFilterLink *link)
Definition: vsrc_color.c:145
void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4], uint8_t *src[4], int pixelstep[4], int hsub, int vsub, int x, int y, int w, int h)
Definition: drawutils.c:82
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
static const AVOption options[]
Definition: vsrc_color.c:164